fix torch-tensorrt dependency in testing

[GdoongMathew]

What does this PR do?

Fixes #21412

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---

📚 Documentation preview 📚: https://pytorch-lightning--21413.org.readthedocs.build/en/21413/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (79ffe50) to head (22e9a03).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (79ffe50) and HEAD (22e9a03). Click for more details.

HEAD has 3350 uploads less than BASE

Flag	BASE (79ffe50)	HEAD (22e9a03)
cpu	777	29
lightning_fabric	195	0
pytest	390	0
python3.12	233	9
python3.12.7	232	8
lightning	388	14
python3.11	156	6
python3.10	78	3
python	78	3
pytorch2.1	78	6
pytest-full	387	29
pytorch_lightning	194	15
pytorch2.6	39	3
pytorch2.4.1	38	2
pytorch2.3	39	3
pytorch2.2.2	39	3
pytorch2.5.1	38	3
pytorch2.9	39	3
pytorch2.7	39	3
pytorch2.8	38	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21413     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         269      266      -3     
  Lines       23804    23754     -50     
=========================================
- Hits        20626    18722   -1904     
- Misses       3178     5032   +1854